Travelling wire coil cutter



Jan. 20, 1959 Filed April 5. 1954 TRAVELLING WIRE COIL CUTTER S. A. PLATT 3 Sheets-Sheet l havomor: Sfephen A. P/afi y A/fys 1959 s. A. PLATT TRAVELLING WIRE con CUTTER 3 Sheets-Sheet 3 Filed April 5. 1954 lg mg /nvenfor: Sfephen A. P/afl United States Patent 2,869,640 TRAVELLING WIRE con. CUTTER Stephen A. Platt, Grand Haven, Mich. Application April 5, 1954, Serial No. 421,015 10 Claims. c1. 164-43) This invention relates to the problem of cutting lengths from a wire coil which travels lengthwise while rotating about its axis. The invention is particularly concerned with this problem when the wire is drawn from an alloy of the kind used for electric resistance heating elements and is very easily work-hardened, and when the cut lengths must each have the same electric resistance within a very narrow tolerance range.

A coil of suchelectric resistance wire is ordinarily produced by coiling the wire on a rapidly rotating mandrel, whereby the coil is produced as a continuously travelling and very rapidly rotating product. The motion of this coil cannot be interfered with very much without introducing trouble at the coiler where the mandrel is located. The lengths should be severed so that they all have the same lengths and this should be done without deforming or nicking the coil convolutions adjacent to the cuts.

One of the objects of the presnt invention is to meet the above requirements in a manner that is more commercially reliable than has heretofore been possible. Other objects may be inferred from the following disclosure of a specific example of one form of the invention which is provided for the purpose of disclosing and explaining the principles. This disclosure is effected by the following description which refers to the accompanying drawings in which:

Fig. 1 is a top view showing the coiler producing the coil and the cutter and its control mechanism;

Fig. 2 is an exploded view showing'the component parts of the cutter device per se;

Fig. 3 is a sectioned perspective view showing the action of the cutter;

Fig. 4 is a vertical view showing the cutter and its mounting parts, a portion of the latter being in vertical cross section;

Fig. 5 is a top view of Fig. 4;

Fig. 6 is a cross section taken on the line 6-6 in Fig. 4;

Fig. 7 is a front view of the cutter showing a first phase of the cutting operation;

Fig. 8 is a cross section taken on the line 88 in Fig. 7;

i Fig. 9 is the same as Fig. 7 excepting that it shows a second phase;

Fig. 10 is a cross section taken on the line 1010 in Fig. 9; I

.Fig. 11 is again the same as Fig. 7 excepting that it shows a third phase in the cutting operation; and

Fig. 12 is a cross section taken on the line 12-1 in Fig. 11.

Referring to these drawings, the electric resistance wire being coiled may be of the type designed to operate at high temperatures and which has a composition causing it to work-harden rapidly. It is ordinarily very malleable. These characteristics, together with the requirement that coil lengths of nearly perfect form and 'freefrom deformed ends must be produced within very The wire then travels upwardly to a rapidly rotating mandrel 4 on which it is coiled by powered rotaryelements 5 and 6. The mandrel 4 is held in a chuck 7 and this chuck together with rotary flexible shafts 8 for the elements 5 and 6, all project from a powered driving unit 9.

The wire coil 10 leaves the mandrel 4 in a curved path viewed in plan and is necessarily rotating about itsaxis while it travels forwardly at a linear speed determined by the pitch of its convolutions and its rotating speed. The coil, of course, travels forwardly in the fashion of a screw because of the manner in which the coil is helically wound. The coil may rotate at speeds of over 4,000 R. P. M., yet it must be cut to precise lengths with sharp and cleanly defined cuts and without damaging any of the convolution in any way.

The coil feeds horizontally over a table 11 on which the coil is positioned by retainers 12. A photo-electrically-operated device, generally indicated at 13, is located relative to the table to actuate an electric circuit for the purpose of controlling the actutaion of the cutter which then severs the length desired from the coil 10. The table 11 is made to retract momentarily to drop the severed coil length.

The present invention embodies a new method which embraces the coiling of the wire by using a liquid lubricant, such as a soapy water, an emulsion of oil lubricant and water, and the like, so that the coil arrives at the cutting location with its wire convolutions coated with this liquid lubricant. Each desired length is cut from this coil with a sharp-edged blade by supporting one side of the coil against retreating from the blade while forcing the sharp edge of the blade transversely against the opposite side of the coil. This force is proportioned so that it is initially insufficient to deform or cut the coil but is sufficient to cause the blades sharp edge to yieldingly feel its way between the coils liquid-lubricated convolutions. There is always a chance that the sharp edge of the blade will initially engage squarely with the outside of one of the coils convolutions, and by theme of the yielding or limited force the motion of the blade is permitted to hesitate until the coil slips to one side or the other from the'center line of the convex side of the wire forming. the convolution initially engaged. During this time the coil is rapidly rotating and is not damaged in any way, and while the blade feels its way between turns or convolutions the coil can screw itself past the blade without moving the latter in the travelling direction of the coil. The lubrication further contributes substantially towards preventing the wire coil from being harmed. At this point the force applied to the blade is rapidly or suddenly increased so as to cause the sharp edge to pass through the coil between turns and cut through the supported side of the coil where there is no danger of deforming the coil as there is on the latters unsupported side. The blade'is then rapidly withdrawn to a location free from the coil. The initial force applied to the blade is of an elastically yielding nature and when the time comes for cutting this force is suddenly increased by applying a hammer-like impact to the blade.

With the above in mind, the cutter, illustrated by the drawings, comprises a horizontally extending bracket 14 having opposed end portions 15 and 16, respectively. The end portion 15 is formed by upper and lower arms having vertically aligned holes through which anchored pivot pins 17 are arranged to mount the bracketpivotally aseaeeo on a vertical axis so that the brackets other end 16 "swings horizontally. The pivot pins 17 are, of course, vertically aligned.

The swinging end 16, of the bracket 14, has a hole 18formed therethrough substantially tangentially with resp ct to this portions swinging motion; The coil is fed throughthis' hole 18.

' As illustrated the hole 18 is preferably formed through. a "die"19 which is removably 'mounted'in a hole 20,. formed in "the bracket 14, and which is rele'asablylocked. "in position by a screw 21. The hole 18 is made just. slightly larger in diameter thanthe coil 10, and a pluralityof dies,suchas the die 19, may be provided, each. with a die" hole of adiiferen't size for accommodating coils ofdiiferent sizes, size having reference to diameter. pivot is iriounted onthie'bracket adjacent to the hole'20'inwhichthe die 19is rnounted. This pivot 6X tend s through a hole 23 formed in the end portion 16 of l the bracket, thepivot having an enlarged head .24, pro-- vided'with screwdriver slot, and a threaded opposite nd 25 on whichanut '26 is secured to mount the pivot 22. p I

' The cutting is effected by a very light-weight knife: blade 27 which is pivoted on the pivot 22 and has a sharpedge .28 whichswings transversely past the opening to the die hole -18' so as to cut the 'coil as it leaves the hole 18. i A r'el'ativelyheavy lever 29 is pivoted on the pivot. .22 so as' to swingconcentrically with respect to the blade i27,"and the' t wo are interconnected by a lost-motion. means. Ihis' 'rneans is shown as comprising an inter- ;r'nediate lever 30, also pivoted on the pivot 22, and which has a pocket 31 in which the' blade '27 is fitted so that it;1Iiay swing fora limitedextent relative to the interiatele'ver I3=0. This' lev'ei is in turn adjustably dri gi'd ly with respect to the lever 29 by a screw 32 which passes through an arcuate slot 33 formed in the ilever-29 concentric with'respect to the pivot 22, the screw SZeXtendin'g into a threaded hole 34 formed in the intermediate lever .30; When the screw'32 is tightened in the hole 34 the levers" 29 and,30 fare 'clamped together e 'ti 's mmovabl As illustrated; ,the bladelandeac h of the two levers have. holes 23a, 23b and. 24b, respectively, through which the,pivot 2 2 passes.

The blade l2 5 ii s biased gentlytowards its advancing .positionby a. relatively large. diameterfloop of spring wire 35 havingone end fixed ttithelevei 29 and its 'other'end bent inwardly and extending through arcuate slots 36 and 3.7, lfortned. through the twolevers 29 and '30, respectively, and so as to abut behind the blade 27v with respect towhichtlie spring 'en'dis located by'a notch 38 formed in theback ofIthe blade.

i -.-Preferablythe die hole 18 is inclined with respect to the axis: of theidi .19 and thehole 2 0, so th'at the coil eonvolutions on the s idebf the hole closest'to the knife blade,aresubstantially" parallel.to the front surface of l'the ;die and of the bracket over which theblade 27; slides yvithin; theconfines of the recess 3 1fformed in thelintern ediateleVer SO. i

-The pivot pins 17project towards each other and are mounted by two vertically interspaced rings 39 and 4 0 which are secured inside of avertical tube .42 having a transverse window 43 forrnedtherethrough and through which the bracket transversely' extends. .Ihis tube 42 serves as amount for. the cutter, the tube havinga flange 44 by which it isv secured through a hole formed in'a .worktable 45 i which is suitably mounted horizontally. Ihe flange 4 4 ispreferably secured to. the table. by screw fastenings 46 which engage the opposite sides of the .tablelhrough elastically deformable shock absorbing washer i The ver 29 advances the blade .27 forcutting, and the swinging end,;29a.,0f thislevenis provided with a .transve ..h 1 4 c nn c n ro 49 cti ne t's wit th leveribyrenfin .Whi ..11a l99 ?1 99 th s :is eiiected niechanically raiser .than in some I other .Iashibn, will; nowl 'be described. in operation: i

" The described cutter'is initially set-Tupi so that the sharp edge ZSof t he blade 27 just safel y clear th i w wit'h'tli'ides'ciiption of t he ope 3101c 48, the latter being elongated radially with respect fto the pivot 22, and'this rod 49 depends downthrough the tube substantially vertically to a remote location below the table 45, where the lower end of the rod is :secured, by a connection 50 (with the armature 51 of a =-comrnercial magnetic device having a reciprocating sole- .noid 52 which, when energized, draws the armature 51 downwardly with great force and speed. It should be 'noted that the end. 29a of the lever..29, and the hole 48, are locatedquite'close to the pivot pins 17, the rod 49 being correspondingly nose anddescending substantially vertically and substantially parallel to the common vertical axis of thetw'o pins 17.

A long coilspring. 53.has.its. upper end anchored to the ring 39 and its lower end connected, at 54, with the armature 51. This counterbalances the weight of the rod 49, of the armature 51 and of the lever 29, and in addition biases the lever arm. 29 upwardly. to a location deter ined" by the distance fthatfthef.- armature 51. may be pulled upwardly; the upwa rd stroke of this armature b gr m While fa'ctually cutting the .-coil the cuttermust act as a flying 'sliear or" eu'tt'er' so as as avoid impeding the ilengthwise/travel of the, coil. Itisj foi'f this reason. that F "the bracket isfpi'votally mounted by; the: pivot pins 17.

Thebr'aCket is? biased to' 'swing oppositely to the coils travelling "direction by a ,co'il' tension spring which 'is securedft'o a braeket 57 eirtending. from. the top of: the tube 42. Inc horizontal -s vvin mg forward limitofjthe [bracket isfi'x'ed by., 1n adjnstableitop 5 8 whichis screwed "through the end ofltlieT'B'rack et'SI 'solas to be, engagediby the bracket 14 when the latter'is p ulled forwardly by ft he .Esprifig: i.

' The importance of the arrangement 0f.the pa :scribed lierifibbve, rld th degree Of the elast i the spring .?y5, and the relative weights or the bl i 9 bestfb'" emphasized Zi C fiction H V u I, W H I: ration oftheldes cnbedEpparatus. This operation, whereby: the described method ..-9 n the described coiler and travelling. lengthwise, wh e 10- qtating rapidly,-through theidie holeli lsl The' eoil is coated witl'lliquid lubricant as previously described. V The location ofjfthe bladeis fixed proper setting of the ang'ulanrela'tion between the levers l 29 and "'30 by appropriate use of the screw 32. The blade. 27 is; of course, biased forwardly by its springSS. I With this setnp the coil is cut whenever the solenoid 52 isf ene rgized under the eontr'ol ofgtheldevice 13: previously In 'tioned.

When energized thearmature sl is jerked dow great speed. Due to the great length of the the. latter exerts a .pull .fof,relatiyelyeonstantl value, and, thereforefthe armature '51" does not meet greatly increasing I resistance exerted by this spring 53las the latter expands. i H i It is to be noted that. the eoil of resistance wire, can be supported against the action of the cutting blade only on the side of the coil opposite to this blade. All of its other portions are unsupported respecting the forcewhich must be applied by the blade. tothecoil to effect cutting. This is one of the things that makes the cutting problem so severe, because the" application of cutting force to the coil anywhere excepting' directly opposite to its convolution portion which can be supported; "results in deformation of the coil. i i

In the case of the present invention the firstaction is a's shown by Fig's. 7 nti S Wh eretlie tra edge is "of the blade 27 is initially engaging the mapper-ad the can 1 10. h r" of chance and the eharfii fleen e the cross section of the one of the wire convolutions. This condition is illustrated by these Figs. 7 and 8.

The velocity of the cutting motion is so great that the weight of the parts must be considered. This has been done in the case of the present invention, the blade 27 being thin and light in weight, its actual weight being adjusted so that at the velocity with which the blade is moved the resulting force, plus the force exerted by the spring 35, is insufficient to nick the wire or deform the coil shape, even under the illustrated conditions. This means that the spring 35 must exert just a gentle force to the blade which is at most insufficient to result in the coil being nicked or deformed.

The motion of the blade 27 momentarily ceases while the lever 29 continues to descend at high speed. The

coil is rapidly rotating and is subject to vibration which very quickly causes the coil turns or convolutions to slip ahead of or behind the squarely engaged convolution, the elasticity of the spring 35 being adequate to urge the blade 27 continuously forwardly. The liquid lubricant on the coil assists in this action and the rapid rotation of the coil works with the lubrication to prevent any appreciable nicking or, premature cutting of the coil.

The next phase is shown by Figs. 9 and 10 where the sharp edge 28 has slipped between the coil convolutions. The elasticity of the spring 35 must be sufficient to cause the blade to index between the convolutions during this action, but the elasticity should not be substantially greater than this small amount. During this time the coil screws itself over the blade so that no forward force is exerted on the blade and the bracket 14 is not required to swing. There is little resistance to the coils rotation and, of course, no resistance to its forward or lengthwise travel. Remembering that the lever 29 has been all the time descending at very high velocity, the

lost motion, provided by the recess 31, is taken up with tremendous speed and the entire force resulting from the weight and speed of the lever 29 and the intermediate lever 30 is applied solidly to the back edge of the blade 27 with a hammer-like blow which quickly and cleanly drives the sharp edge 28 through the coil, between convolutions, and cutting through at the support side of the die hole 18. The solenoid 52 is energized momentarily, so almost immediately the spring 53 raises the lever 29 and rapidly withdraws the blade 27 to a location where its sharp edge 28 clears the coil.

During the brief interval that the blade passes through the coil and the coil is nipped between the blade and the die, both its rotation and lengthwise travel are halted. Due to the great rotative speed, the nipped convolution confined inside of the die hole 18, expands slightly and braces itself solidly inside of the die so as to further assure aclean cut. During this brief action the bracket 16 swings or flies with the work with the result that the latters travel, with respect to the mandrel of the coiler, continues. The momentary halt in its rotation is taken up by the length of the coil 10 between the cutter and the coiler without damage to the coil and without causing trouble at the coiler.

During the necessary swinging of the bracket 14 it is important to avoid any resistance to theswinging action. This is why the rod 49 is located as close to the axis of the pins 17 as is physically possible, this bringing all necessary connections to a substantially common pivotal axis. This also dictates the general design of the cutter so the heavy parts do not affect the swinging action of the cutting head. The movement of the bracket 14 is very small in any event, due to the rapidity with which the blade is advanced and withdrawn.

This final cutting phase is shown by Fig. 3 as well as by Figs. 11 and. 12. Fig. 3 has the advantage that it more clearly shows the manner in which the nipped convolution momentarily expands and braces itself within the die hole 18. a

The importance of maintaining the blade 27 very light,

and in accurately proportioning the elasticity and form of the spring 35, should now be realized. It makes possible the great speed of action described hereinabove, be cause in spite of the high velocity the blade 27 cannot damage the coil as the blade engages the latter and feels its way along to the solidly supported side of the coil where the cutting may be effected cleanly and without damage to the coils form. The extremely rapid but at the same time gentle and hesitating blade feeling action, is at the appropriate time automatically followed by the heavy cutting blow and the rapid withdrawal.

It follows from the foregoing that in spite of the workhardening properties and malleability of most if not all electric resistance heating wire alloys, that the coils are severed without working the wire so as to work-harden it and without deforming or nicking the coil at the severed portion.

It is to be noted that the blade and levers swing forwardly and backwardly, or, in other Words, that they are reciprocative. The pivot 22 is tangentially arranged with respect to the swing of the bracket 14 about the vertical axis fixed by the pivot pins 17. The lever 29, of course, swings in a vertical plane substantially parallel to this just-mentioned vertical axis. The rear face of the wall defining the pocket 31 abuts squarely and solidly with the rear edge of the blade 27 so as to deliver the impact which has been described. Although two pins 17 have been described they cooperatively function to form a single pivot, as though only one pin was used.

I claim:

1. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter including a support for transversely supporting one side of the coil, a reciprocating blade having a sharp edge, and means for advancing said blade with an initial force which is insuflicient to deform or cut said coil but is sufficient to cause said edge to feel its way between the coils convolutions at said opposite side which force then increases so as to advance said edge through the coil to said supported side and cause said edge to out said coil at said supported side thereof, said means comprising an element having means for moving it to advance said blade with said increased cutting force, means for interconnecting said element and blade with a lost motion therebetween, and an elastic means resisting said lost motion with said initial force.

2. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter including a support for transversely supporting one side of the coil, a reciprocating blade having a sharp edge, and means for advancing said blade with an initial force which is insufficient to deform or cut said coil but is sufiicient to cause said edge to feel its way between the coils convolutions at said opposite side, which force then increases so as to cause said edge to advance through the coil to said supported side to cut said coil at said supported side thereof, said means comprising an element having means for moving it to advance said blade with said increased cutting force, means for interconnecting said element and blade with a lost motion therebetween, and an elastic means resisting said lost motion, said initial force being derived from the elastic force of said elastic means and the momentum of said blade, said element moving means moving said element at predetermined velocity and said blade having a weight which is less than would cause said blade; moving at said velocity to exert a force which, when added to the elastic force of said elastic means, would be suflicient to deform or out said opposite side of said coil upon initially engaging the same.

3. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter including a sup port for transversely supporting one side of the coil, a reciprocating blade having a sharp edge, and means for advancing said blade with an initial force which is insufficient to deform or cut said coil but is sufiicient t'o a cause said edge to feel its way between the coils conblade with a lost motion therebetween, and an elastic means resisting said lost motion, said initial force being derived from the elasticforce of said elastic means and the momentum of said blade, said element moving means moving said elementatpredetermined velocity and said blade having a weight-which is less than would cause said blade moving at said velocity to exert a force which, when added to'the elastic force of said elastic means, would be suflicient to deformor cut said opposite side of said coil upon initially engaging the same; said ele ment being substantially-heavier than said blade and said inter-connecting means forming rigid interengaging surfaces for said blade and element respectively so that said element delivers a hammer=like impact to said blade after taking up said lost motion.

4. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter including a support for transversely supporting one side of the coil, a reciprocating blade having a sharp edge, and means for advancingsaid blade with an initial force which is insufficient to deform. or cut said coil but is suflicient to cause said edge to feel its 'way between the coils convolutions at said opposite side which force then increases-- the latter is entered therein prior to cutting the coil,

means for returning said blade to a location clearing said coil after the blade has cut the latter, and means'for mounting said blade reciprocatively and sothat it can fly with said coil while the blade is cutting the latter and is being returned to said location.

5. A'cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter including a support for transversely supporting one side of the coil, a reciprocating blade having a sharp edge, and means for advancing said blade with an initial force which is insuihcient to deform or cut said coil but is sufficient to cause said edge to feel its way between the coils convolutions at said opposite side which force then increases so as to cause said edgeto advance through the coil to said supported side to out said coil at said supported side thereof, said support comprising a die having a passage slightly larger in diameter than the coil and through whichthe latter travels, said blade momentarily anchoring said coil against rotation while cutting the coil and thus causing the coils convolution in front of the blade to expand, due to slight unwinding, and brace itself against the inside of said passage. i l

6. A cutter for travelling work and including a bracket,

a movable blade mounted on saidbracket, means for cent to said axis, and means for movingv said rod linearly and which is located remotely from said bracket.

7. A cutter for a wire coil which travels lengthwise avhi le rotating-about its axis, said cutter comprising a horizontally extending bracket having opposed end portions, means for pivotally mounting one of said end portions on a vertical axis so that'the other of said end portions swings horizontally, saidother-or swinging end por- *IlOIl having a hole =formedgherethrough substantially -tangentially with respect to-this'portions swinging motion and through which said coilisfed, apivot mounted on said-bracket adjacent to said-hole and substantially tangentially arranged with respect to saidswinging portions motion, a light-weight knife bladepivoted on said pivot and having a sharp edge swinging transversely'past one [of said holes openings so as to cut the coil passing therethrough, a relatively heavy .lever pivoted on said pivot, lost-motion means for interconnecting said-blade and lever, and an elastic means for resisting the movement elastic means and seversaid coil.

8. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter comprising a horizontally extending bracket having opposed end portions, means for pivotally mounting one of said end por- :tions on a vertical axis so that the other of saidend portions swings horizontally, said other or swinging .end

portion having a-hole formed therethrough substantially tangentially with respect to this portions swinging motion and through which said coil is fed, a pivot mountedon said. bracket adjacent to said .holeand substantially tangentially arranged with respect to said swinging portions .motion, a lightweight knife blade pivotedon said pivot and having. a. sharp edge swinging transversely past one of saidholes openingsso as to .cut thecoil passing therethrough, a relatively heavyslever pivoted on said pivot,

. lost-motion means for interconnecting said blade and lever, and an elastic means forwresisting .the'fmovement .of said. blade within the limits. of .said lost-motion means,

said lever having an. end portion extending to a location .at least ,adjacent to. saidaxis and .swinginginaplane substantially parallel to the latter, said lever solidly engaging said blade when the: latters. said edge. solidly engages the coil so asfto overcome itheresistance. of said elastic. means and. sever. said. coil, and aconnecting rod connected to said lever said end .portionv and extending substantially vertically and parallel with respectto .s'aid axisand having. an end=.por.tion.remote from saidbracket, and powered meansconnected to said rods end. portion for moving said rod linearly. to..swing saidlever, and a spring connected to said rod and. said. levers end portion and. tosaid. powered. means soas .to. counterbalance their weight and bias said levers end portion toretractsaid blade relative to said hole.

9. A cutter for auwirewcoil which travels lengthwise .while rotatingabout its axis, said cutter comprising a horizontally extending bracket having opposed end portions, means for pivotally mounting one'of said end portions on a vertical axis so that the other of said end portions swings horizontally, said other or swinging end portion having a hole formed therethrough substantially tangentially with respect to this-por tions swinging motion and through which said coil is fed, a pivot mounted on said bracket adjacent to said hole and substantially tangentially arranged with respect to said swinging portions motion, a light-weight knife blade pivoted on said pivot and having a sharpedge swinging transversely past one of said holes openings so as to cut the coilpassmg therethrough, a relatively heavy lever-pivoted on said pivot, lost-motion means for interconnectin'g'said blade and'lever, and an elasticlmeans resisting the movement of said blade within the limits of said lost-motion means, said lever having an end portionextending to a location elastic means and sever said coil, said brackets swinging end portion swinging with the coils travel durmg cutting action of said blade, and a stop for locating said swinging end portion and a spring arranged to bias said swinging end portion against said stop.

10. A cutter for a wire coil which travels lengthwise while rotating about its axis, said cutter comprising a horizontally extending bracket having opposed end portions, means for pivotally mounting one of said end portions on a vertical axis so that the other of said end portions swings horizontally, said other or swinging end portion having a hole formed therethrough substantially tangentially with respect to this portions swinging motion and through which said coil is fed, a pivot mounted on said bracket adjacent to said hole and substantially tangentially arranged with respect to said swinging portions motion, a light-weight knife blade pivoted on said pivot and having a sharp edge swinging transversely past one of said holes openings so as to cut the coil passing therethrough, a relatively heavy lever pivoted on said pivot, lost-motion means for interconnecting said blade and lever, and an elastic means resisting the movement of said blade Within the limits of said lost-motion means, said lever having an end portion extending to a location at least adjacent to said axis and swinging in a plane substantially parallel to the latter, said lever solidly engaging said blade when the latters said edge solidly engages the coil so as to overcome the resistance of said elastic means and sever said coil, said pivotal mounting means comprising a vertical tube having a transverse window formed therethrough and mounting a vertical pin on which said brackets pivoted end is mounted, said pin being located inside of said tube adjacent to said window and said levers end portion projecting through said window and said connecting rod extending longitudinally through the inside of said tube, and means for mounting said tube in an upstanding position.

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